Linked from
The 12 pages that link to Basidium, each with the reason it gives.
Pleurotus ostreatusRelated: Its gills bear basidia that generate the mushroom’s spores.
PuffballRelated: Basidia within the spore mass produce puffball basidiospores.
AgaricusRelated: Agaricus produces its sexual spores on basidia lining its gills.
Volvariella volvaceaRelated: The mushroom’s gills bear basidia that produce its spores.